19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Tetragonal crystal system has the following unit cell dimensions
The number of atoms contained (i) in one body centred cubic unit cell and (ii) in one face centred cubic unit cell, is
Which defect causes decrease in the density of crystal
The formula for determination of density of unit cell is (a) a N g cm N M A x x (b) M g cm a N A Z x x (c) a M g cm N N A x x (d) M N g cm a N A x x
A metal has bcc structure and the edge length of its unit cell is 3.04Å. The volume of the unit cell in cm will be
Solid CO₂ is an example of
Which of the following is a pseudo solid
Which of the following is an example of metallic crystal solid
Assertion : Covalent crystals have a higher melting point. Reason : Covalent bonds are stronger than ionic bonds.
Assertion No compound has both Schottky and Frenkel defects. Reason Both defects change the density of the solid. [AIIMS 2008]
The number of atoms per unit cell of bcc structure is [Kerala CEE 2009]
Which of the following is non-crystalline solid
Given, Column A Column B A. Ionic solid I. NaCl B. Metallic solid II. Fe C. Covalent solid III. C(graphite) D. Molecular solid IV. Dry ice
On the basis of their magnetic properties, substances can be classified into …A… categories. Here, A refers to
A solid is formed by two elements P and Q. The element Q forms cubic close packing and atoms of P occupy one third of tetrahedral voids. The formula of the compound is [AMU 2010]
Identify the incorrect statement.
Those substances which show permanent magnetism even in the absence of magnetic field are called
Doping of silicon (Si) with boron (B) leads to
Number of unit cells in 4 g of X (atomic mass = 40) which crystallises in bcc pattern is (NA = Avogadro's number) (OJEE 2010) (a) A 0.1N (c) A 2 0.1N x (b) A 0.1N (d) A N x
Electrons in a paramagnetic compound are
The property of crystalline solid is not
Potassium has a bcc structure with nearest neighbour distance 4.52 Å. Its atomic weight is 39. Its density will be
For tetrahedral coordination the radius ratio r r should be
The ratio of cationic radius to anionic radius in an ionic crystal is greater than 0.732. Its coordination number is
Lithium has a bcc structure. Its density is 520 kg m–3 and its atomic mass is 6.94 g mol–1. Calculate the edge length of a unit cell of Lithium metal. (NA = 6.02 × 1023 mol–1) (NEET 2016)